Multi-box-chamber cast-in-place box girder and forked type widening cast-in-place box girder

Abstract

The multi-box-chamber cast-in-place box girder comprises a multi-box-chamber box girder body, a first integrated pipeline and a second integrated pipeline, the first integrated pipeline is arranged on a middle web plate of the box girder body, and the two sides of the first integrated pipeline extend into two adjacent box chambers of the box girder body respectively. First through holes are formed in the two sides of the upper end of the first integrated pipeline, first drainage pipes are arranged at the lower ends of the two sides of the first integrated pipeline correspondingly, and the first drainage pipes extend out of a bottom plate of the box girder body; second integrated pipelines are arranged on side webs of the box girder body correspondingly, vertical sections of the second integrated pipelines are located in a box chamber of the box girder body, second drainage pipes are arranged at the lower ends of the vertical sections of the second integrated pipelines and extend out of a bottom plate of the box girder body, and second through holes are formed in the inner sides of horizontal sections of the second integrated pipelines. And the outer side of the horizontal section of the second integrated pipeline extends out of a side web of the box girder body. According to the utility model, the adverse effects of overlarge temperature stress and stress of the box girder are reduced.

Description

Technical Field

[0001] The utility model relates to the field of municipal road traffic, in particular to a multi-chamber cast-in-place box girder and a bifurcated variable-width cast-in-place box girder. Background Art

[0002] In order to cope with traffic from different directions, more and more urban overpasses are being built, and traffic is diverted through the diversion lanes of the overpass. The connecting section between the main lane and the diversion lane of the overpass is called a bifurcated variable-width cast-in-place box girder. Because this structure looks like a pair of pants, it is also called a pants beam. Figure 1 As shown. Since the bifurcated variable width cast-in-place box beam is a multi-chamber box beam, it is necessary to set exhaust holes to make the temperature between the chambers similar to avoid excessive temperature stress caused by large temperature differences. However, the exhaust pipe and drain pipe of the existing box beam are set separately, and the pipe insertion is not standardized, which can easily lead to blockage of the exhaust pipe and drain pipe. In particular, the requirements for exhaust are higher in the triangular area of ​​the trousers beam.

[0003] In addition, due to the complex stress conditions of the underpants beam, bridge piers and broken line cap beams are usually set here, but this solution has some problems, such as large footprint and high cost of broken line cap beams. If a lane needs to be set under the underpants beam, adding bridge piers under the underpants beam will make it impossible to set up the lane, which will cause great inconvenience to the traffic below. Another solution is to use separate cap beams for different ramp directions. Although it avoids the problem of broken line cap beams, it may also cause inconsistent settlement of the ramps on both sides, resulting in settlement differences between the main beam and one side of the ramp, which will cause strong vibrations when vehicles pass. Summary of the invention

[0004] The utility model aims to provide a multi-chamber cast-in-place box girder and a bifurcated variable-width cast-in-place box girder to address the deficiencies of the prior art, which can reduce excessive temperature stress of the box girder and the adverse effects of stress.

[0005] The technical solution of one of the invention purposes of the utility model is:

[0006] A multi-chamber cast-in-place box girder comprises a box girder body with multiple box chambers, and also comprises a first integrated pipe and a second integrated pipe, wherein the middle web of the box girder body is provided with the first integrated pipe, the first integrated pipe is in an inverted U-shaped structure, the two sides of the first integrated pipe respectively extend into the two adjacent box chambers of the box girder body, the upper end of the first integrated pipe is provided with first through holes on both sides, the two adjacent box chambers of the box girder body are connected through the first through holes, the first through holes are provided with first drainage covers, the lower ends of the two sides of the first integrated pipe are respectively provided with first drainage pipes, and the first drainage pipes extend out of the bottom plate of the box girder body; the side webs of the box girder body are respectively provided with the second integrated pipes, the second integrated pipe is in an inverted L-shaped structure, the vertical section of the second integrated pipe is located in the box chamber of the box girder body, the lower end of the vertical section of the second integrated pipe is provided with a second drainage pipe, and the second drainage pipe extends out of the bottom plate of the box girder body, the second through hole is provided inside the horizontal section of the second integrated pipe, the second through hole is provided with a second drainage cover, and the horizontal section of the second integrated pipe extends out of the side web of the box girder body.

[0007] Furthermore, the extended ends of the side webs of the second integrated pipeline are respectively provided with cover eaves and protective nets.

[0008] Furthermore, the first through hole and the second through hole are arranged obliquely.

[0009] Furthermore, the inclination angles of the first through hole and the second through hole are the same as the chamfer angles of the box chamber in the box beam body.

[0010] The technical solution of the second invention objective of the utility model is:

[0011] A forked variable-width cast-in-place box girder comprises a main box girder and a ramp box girder, wherein a triangular area is arranged between the main box girder and the ramp box girder, and the main box girder and the ramp box girder form a first cast-in-place box girder with multiple box chambers, wherein the first cast-in-place box girder adopts the above-mentioned multi-box chamber cast-in-place box girder.

[0012] Furthermore, the main box girder, the ramp box girder and the triangular area form a second cast-in-place box girder with multiple box chambers, and the second cast-in-place box girder adopts the multi-box chamber cast-in-place box girder.

[0013] Furthermore, the length of the triangular area between the main box girder and the ramp box girder is half of the lateral projection length of the corresponding box chamber.

[0014] Furthermore, a triangular area between the main box girder and the ramp box girder is provided with an arc chamfer.

[0015] Furthermore, bridge piers are respectively arranged at both ends of the front and rear adjacent box girders corresponding to the triangular area between the main box girder and the ramp box girder.

[0016] The adoption of the above technical solution has the following beneficial effects: the box girder body with multiple box chambers is connected to the inside and outside of the box girder chamber by arranging the first integrated pipe and the second integrated pipe, thereby effectively avoiding excessive temperature stress, and the first and second integrated pipes not only have a ventilation effect, but also have a drainage effect, so that the accumulated water in the box girder chamber can be discharged in time.

[0017] The main box girder and ramp box girder of the bifurcated variable-width cast-in-place box girder adopt the first integrated pipe and the second integrated pipe of the multi-chamber box girder to reduce the temperature stress of the box girder.

[0018] The triangular area between the main box girder and the ramp box girder adopts the first integrated pipeline and the second integrated pipeline of the multi-chamber cast-in-place box girder. Because the triangular area is more sensitive to the temperature difference between the inside and outside, the first integrated pipeline and the second integrated pipeline can effectively solve the temperature difference between adjacent box chambers of the box girder.

[0019] The length of the triangular area between the main box girder and the ramp box girder is half of the projection length of the corresponding box chamber along the bridge direction. The length ratio of the triangular area reduces the adverse stress effect at the crotch of the overpass to a minimum.

[0020] A triangular area between the main box girder and the ramp box girder is provided with an arc chamfer, which can reduce stress concentration and effectively prevent cracking.

[0021] Bridge piers are respectively arranged at both ends of the front and rear adjacent box girders corresponding to the triangular area between the main box girder and the ramp box girder, and no bridge piers are arranged in the triangular area where the main box girder and the ramp box girder intersect, and the bifurcation is directly crossed. This design scheme can not only save space and reduce costs, but also reduce the impact on the traffic road setting below the intersection of the main road and the ramp, thereby improving traffic smoothness.

[0022] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an existing trousers beam;

[0024] Figure 2 It is a structural schematic diagram of specific embodiment 1;

[0025] Figure 3 is a schematic structural diagram of the first integrated pipeline in specific embodiment 1;

[0026] Figure 4 This is a schematic diagram of the first integrated pipeline in the specific embodiment 1 being arranged on the side of the chamber;

[0027] Figure 5 is a schematic structural diagram of the first drain cover in specific embodiment 1;

[0028] Figure 6 is a schematic structural diagram of the second integrated pipeline in specific embodiment 1;

[0029] Figure 7 It is a structural schematic diagram of specific embodiment 2.

[0030] In the accompanying drawings, 1 is the box girder body, 1-1 is the middle web, 1-2 is the side web, 2 is the first integrated pipe, 2-1 is the first through hole, 2-2 is the first drain pipe, 3 is the second integrated pipe, 3-1 is the second through hole, 3-2 is the second drain pipe, 4 is the first drain cover, 5 is the second drain cover, 6 is the cover eaves, 7 is the protective net, 8 is the first support seat, 9 is the second support seat, 10 is the main box girder, 11 is the ramp box girder, 12 is the triangular area, 13 is the arc chamfer, and 14 is the pier. DETAILED DESCRIPTION

[0031] See also Figures 2 to 6 A multi-chamber cast-in-place box girder comprises a multi-chamber box girder body 1, and also comprises a first integrated pipe 2 and a second integrated pipe 3. The middle web 1-1 of the box girder body 1 is provided with the first integrated pipe 2. The first integrated pipe 2 is in an inverted U-shaped structure. Both sides of the first integrated pipe 2 extend to two adjacent boxes of the box girder body 1. Both sides of the upper end of the first integrated pipe 2 are provided with first through holes 2-1, and the two adjacent boxes of the box girder body are connected through the first through holes 2-1. The first through holes 2-1 are provided with a first drainage cover 4. The lower ends of both sides of the first integrated pipe 2 are provided with first drainage pipes 2-2 respectively. The first drain pipe extends out of the bottom plate of the box beam body 1; the side webs 1-2 of the box beam body 1 are respectively provided with the second integrated pipe 3, the second integrated pipe 3 is an inverted L-shaped structure, the vertical section of the second integrated pipe 3 is located in the box chamber of the box beam body 1, the lower end of the vertical section of the second integrated pipe 3 is provided with a second drain pipe 3-2, the second drain pipe 3-2 extends out of the bottom plate of the box beam body 1, the inner side of the horizontal section of the second integrated pipe 3 is provided with a second through hole 3-1, the second through hole 3-1 is provided with a second drain cover 5, and the outer side of the horizontal section of the second integrated pipe 3 extends out of the side web 1-2 of the box beam body 1. The side web extension ends of the second integrated pipe 3 are respectively provided with a cover 6 and a protective net 7, and the protective net prevents foreign objects from entering the second integrated pipe 3. The first drain cover 4 and the second drain cover 5 are both provided with a plurality of strip-shaped drain holes. In this specific embodiment: the first drain cover 4 and the second drain cover 5 are circular covers with a superior arc structure.

[0032] The first through hole 2-1 and the second through hole 3-1 are both inclined, and the inclination angle of the first through hole 2-1 and the second through hole 3-1 is the same as the chamfer angle of the box chamber in the box beam body 1, so as to facilitate the installation of the first drain cover 4 and the second drain cover 5. The box chamber in the box beam body is provided with a first support seat 8 for supporting and fixing the first integrated pipe and the first drain cover. The box chamber in the box beam body is provided with a second support seat 9 for supporting and fixing the second integrated pipe and the second drain cover. The first support seat 8 is used to facilitate the installation of the first drain cover 4, and the second support seat 9 is used to facilitate the installation of the second drain cover 5. In this specific embodiment: the box beam body 1 has two box chambers, and the middle webs 1-1 of the two box chambers are provided with the first integrated pipe 2, and the side webs 1-2 of the two box chambers are respectively provided with the second integrated pipes. The first integrated pipe 2 and the second integrated pipe 3 are arranged at a certain distance in the box beam body 1. Specific embodiment 2:

[0034] See also Figure 7 As shown: a bifurcated variable width cast-in-place box girder, including a main box girder 10 and a ramp box girder 11, a triangular area 12 is provided between the main box girder 10 and the ramp box girder 11, and the triangular area 12 is used to reduce the stress concentration of the entire configuration. The triangular area 12 between the main box girder 10 and the ramp box girder 11 is provided with an arc chamfer 13, and the curvature of the arc chamfer 13 changes according to the bifurcation angle of the triangular area. The arc chamfer 13 is mainly used to reduce the stress concentration of the bifurcation details. The length of the triangular area 12 between the main box girder 10 and the ramp box girder 11 is half of the length of the corresponding box chamber along the bridge. Bridge piers 14 are provided below both ends of the front and rear adjacent box beams corresponding to the triangular area between the main box beam 10 and the ramp box beam 11, that is, the bridge piers 14 are provided at the front and rear sides of the trousers beam, and the bridge piers 14 are not provided in the triangular area 12 between the main box beam 10 and the ramp box beam 11, thereby avoiding the inability to provide lanes due to the installation of bridge piers at the lower end of the triangular area 12, which brings great inconvenience to the traffic below. The main box beam 10 and the ramp box beam 11 form a first cast-in-place box beam with multiple chambers, and the first cast-in-place box beam adopts the multi-chamber cast-in-place box beam described in Specific Embodiment 1.

[0035] In this specific embodiment: the main box girder 10, the ramp box girder 11 and the triangular area 12 form a second cast-in-place box girder with multiple boxes, and the second cast-in-place box girder adopts the multi-box cast-in-place box girder described in specific embodiment 1. The middle web between the triangular area 12 and the ramp box girder 11 is provided with three first integrated pipes, the outer web of the ramp box girder 11 is provided with three second integrated pipes, the middle web between the triangular area 12 and the main box girder 10 is provided with three first integrated pipes, the outer web of the main box girder 10 is provided with two second integrated pipes, and the outer webs on both sides of the main box girder 10 and the ramp box girder 11 adjacent to the triangular area 12 are provided with two second integrated pipes. The rest is the same as in specific embodiment 1, so this specific embodiment is omitted here.

Claims

1. A multi-chamber cast-in-place box girder, comprising a multi-chamber box girder body, characterized in that: It also includes a first integrated pipeline and a second integrated pipeline, the middle web of the box girder body is provided with the first integrated pipeline, the first integrated pipeline is in an inverted U-shaped structure, the two sides of the first integrated pipeline respectively extend into the two adjacent box chambers of the box girder body, the upper end of the first integrated pipeline is provided with first through holes on both sides, the two adjacent box chambers of the box girder body are connected through the first through holes, the first through holes are provided with a first drainage cover, the lower ends of the two sides of the first integrated pipeline are respectively provided with first drainage pipes, and the first drainage pipes extend out of the bottom plate of the box girder body; the side webs of the box girder body are respectively provided with the second integrated pipeline, the second integrated pipeline is in an inverted L-shaped structure, the vertical section of the second integrated pipeline is located in the box chamber of the box girder body, the lower end of the vertical section of the second integrated pipeline is provided with a second drainage pipe, and the second drainage pipe extends out of the bottom plate of the box girder body, the second through hole is provided on the inner side of the horizontal section of the second integrated pipeline, the second through hole is provided with a second drainage cover, and the horizontal section of the second integrated pipeline extends out of the side web of the box girder body.

2. According to claim 1, a multi-chamber cast-in-place box girder is characterized in that: The extended ends of the side webs of the second integrated pipeline are respectively provided with cover eaves and protective nets.

3. According to claim 1, a multi-chamber cast-in-place box girder is characterized in that: The first through hole and the second through hole are arranged obliquely.

4. The multi-chamber cast-in-place box girder according to claim 3, characterized in that: The inclination angles of the first through hole and the second through hole are the same as the chamfer angles of the box chamber in the box beam body.

5. A bifurcated variable width cast-in-place box girder, comprising a main box girder and a ramp box girder, characterized in that: A triangular area is provided between the main box girder and the ramp box girder, and the main box girder and the ramp box girder form a first cast-in-place box girder with multiple box chambers, and the first cast-in-place box girder adopts the multi-box chamber cast-in-place box girder according to any one of claims 1 to 4.

6. According to claim 5, a bifurcated variable width cast-in-place box girder is characterized in that: The main box girder, the ramp box girder and the triangular area form a second cast-in-place box girder with multiple box chambers, and the second cast-in-place box girder adopts the multi-box chamber cast-in-place box girder.

7. A bifurcated variable width cast-in-place box girder according to claim 5 or 6, characterized in that: The length of the triangular area between the main box girder and the ramp box girder is half of the projection length of the corresponding box chamber along the bridge direction.

8. A bifurcated variable width cast-in-place box girder according to claim 5 or 6, characterized in that: A triangular area between the main box girder and the ramp box girder is provided with an arc chamfer.

9. A bifurcated variable width cast-in-place box girder according to claim 5 or 6, characterized in that: Bridge piers are respectively arranged at both ends of the front and rear adjacent box girders corresponding to the triangular area between the main box girder and the ramp box girder.

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